define eye vergence
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Vergence A vergence is the simultaneous movement of both eyes in opposite directions to obtain or maintain single binocular vision. When a creature with binocular vision looks at an object, the eyes must rotate around a vertical axis so that the projection of the image is in the centre of the retina in both eyes.
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Marcus Gunn pupil Relative afferent pupillary defect (RAPD) or Marcus Gunn pupil is a medical sign observed during the swinging-flashlight test whereupon the patient's pupils constrict less (therefore appearing to dilate) when a bright light is swung from the unaffected eye to the affected eye.
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strabismus comitant strabismus (concomitant strabismus) that in which the angle of deviation of the visual axis of the squinting eye is always the same in relation to the other eye, no matter what the direction of the gaze; due to faulty insertion of the eye muscles.ometimes the eye turn is always in the same eye; however sometimes the turn alternates from one eye to the other'. Most children with strabismus have comitant strabismus. No matter where they look, the degree of deviation does not change.
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refraction ocular refraction the refraction of light produced by the media of the normal eye and resulting in the focusing of images upon the retina. static refraction refraction of the eye when its accommodation is paralyzed.
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Eye tracking Eye tracking. Eye tracking is the process of measuring either the point of gaze (where one is looking) or the motion of an eye relative to the head. An eye tracker is a device for measuring eye positions and eye movement.
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Definitions &Translations Pupil. The pupil is a hole located in the center of the iris of the eye that allows light to enter the retina. It appears black because light rays entering the pupil are either absorbed by the tissues inside the eye directly, or absorbed after diffuse reflections within the eye that mostly miss exiting the narrow pupil.
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eye sighting-dominant eye The eye that is preferred in monocular tasks, such as looking through a telescope or aiming a firearm. eye socket The bony orbit which contains the eyeball, the muscles, the nerves, the vessels, the orbital fat and the orbital portion of the lacrimal gland.eye speculum An instrument designed to hold the eyelids apart during surgery.he organ of vision. In the embryo the eye develops as a direct extension of the brain, and thus is a very delicate organ. To protect the eye the bones of the skull are shaped so that an orbital cavity protects the dorsal aspect of each eyeball.
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Med Term Ch 11 The turning outward of the edge of an eyelid. emmetropia The normal relationships of the structures of the eye that enable light rays to focus correctly on the retina.
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Rosenberg sons acknowledge their father, Julius Rosenberg, was a spy I don't have any reason to doubt Morty, the Rosenbergs' son Michael Meeropol told the Times in Wednesday's editions. Michael was 10 years old when his parents were executed. His brother, Robert, was 6. After living with a series of relatives, the boys were eventually adopted.
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- afferent pupillary defect. Afferent Pupillary Defect (APD) or Marcus-Gunn pupil is a condition of the eye where the pupil doesn't dilate appropriately to the level of light reaching it.This will often result in one pupil appearing larger than the other (relative afferent pupillary defect-RAPD).This person with APD is often unaware of it except by looking in a mirror. There are many causes of APD including Optic Neuritis (ON) , glaucoma and optic nerve tumor.his will often result in one pupil appearing larger than the other (relative afferent pupillary defect-RAPD). This person with APD is often unaware of it except by looking in a mirror. There are many causes of APD including Optic Neuritis (ON) , glaucoma and optic nerve tumor.
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Anatomy of the Eye Cornea The clear front window of the eye which transmits and focuses (i.e., sharpness or clarity) light into the eye. Corrective laser surgery reshapes the cornea, changing the focus. Fovea The center of the macula which provides the sharp vision. Iris The colored part of the eye which helps regulate the amount of light entering the eye.
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- The goals for treating accommodative and/or. vergence dysfunction are to assist the patient to. function efficiently in school performance, at work, and/or in athletic activities and to relieve ocular, physical, and psychological symptoms.
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strabismus The condition in which only one eye is aligned on the object of interest. The other eye may be directed too far inward (convergent strabismus), too far outward (divergent squint), or upward or downward (vertical squint). Squint in childhood, or any squint of recent onset, requires urgent treatment.
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Refractive Errors And Refraction: How The Eye Sees Most refraction in the eye occurs when light rays travel through the curved, clear front surface of the eye (cornea). The eye's natural (crystalline) lens also bends light rays. Even the eye's tear film and internal fluids (aqueous humor and vitreous) have refractive abilities.
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The eye and its contour: a very sensitive area The eye and its contour: a very sensitive area. Very thin, scarcely protected and naturally subject to numerous aggressions, the eye contour is one of the most sensitive parts of the face. For the eye itself and the contour, gentleness is crucial. The eye's surface has a sort of natural shield against various external aggressions (irritants, dust, etc.): lachrymal liquid. Composed notably of organic salts, glucose and oxygen, it nourishes the surface layer of the cornea.
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Medical Definition of Corneal Corneal: Pertaining to the cornea, the clear front window of the eye that transmits and focuses light into the eye.
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Eye Disorders farsightedness; the ability to see distant objects but not close ones; relative length of the eye is too short, the cornea is too flat, or the lens has too little refractive power; focal point is too far from the lens, and the image is focused behind the retina; corrected by convex lens that causes light rays to converge as they approach the eye.
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- The Cornea. The cornea is the clear bulging surface in front of the eye. It is the main refractive surface of the eye. Primary refractive surface of the eye. Index of refraction: n = 1.37. Normally transparent and uniformly thick.
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- From Wikipedia, the free encyclopedia. Pupillometry is the measurement of pupil diameter in psychology. This method established itself after its use in three seminal studies. The method examines humans (including infants) and animals. Pupillary responses occur from birth and are involuntary.
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- Familial exudative vitreoretinopathy (FEVR) (/ ˈ f iː v ər / FEE-vər) is a genetic disorder affecting the growth and development of blood vessels in the retina of the eye. This disease can lead to visual impairment and sometimes complete blindness in one or both eyes.
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Positioning the Monitor Consequently, the right viewing distance is the one at which the computer operator can easily read the screen without experiencing eyestrain. The eyes have a default accommodation distance, called the Resting Point of Accommodation (RPA) and a default Resting Point of Vergence (RPV).
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- A vergee, vergée or, vergee is a unit of, area a quarter of The french. Acre other spellings include vergie and. Vregie vrégie it is NOT an. Si UNIT the si unit of area is the. square metre
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Eye The shrimp has an eye of the refracting superposition type, in the rear behind this in each eye there is a single large facet that is three times in diameter the others in the eye and behind this is an enlarged crystalline cone.
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What does limited physical activity mean? Limited physical activity means restrictions exist for exercise. These restrictions can be for any type of movement. In addition, intensity of the exercise, type of exercise, and frequency of the exercise are ways activity can be limited.
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strabismus noun, Ophthalmology. 1. a disorder of vision due to a deviation from normal orientation of one or both eyes so that both cannot be directed at the same object at the same time; squint; crossed eyes.
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- Definition of LIMBUS. : the marginal region of the cornea of the eye by which it is continuous with the sclera.ADVERTISEMENT.Latin, border.First Known Use: 1877.efinition of LIMBUS. : the marginal region of the cornea of the eye by which it is continuous with the sclera. ADVERTISEMENT. Latin, border. First Known Use: 1877.